/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute.visitor;

import proguard.classfile.*;
import proguard.classfile.attribute.*;

/**
 * This LineNumberInfoVisitor remembers the lowest and the highest line numbers that it finds in all the line numbers
 * that it visits. It ignores the sources of the line numbers.
 */
public class LineNumberRangeFinder implements LineNumberInfoVisitor {
    private int lowestLineNumber = Integer.MAX_VALUE;
    private int highestLineNumber = 0;
    private boolean hasSource;

    /**
     * Returns the lowest line number that has been visited so far.
     */
    public int getLowestLineNumber() {
        return lowestLineNumber;
    }

    /**
     * Returns the highest line number that has been visited so far.
     */
    public int getHighestLineNumber() {
        return highestLineNumber;
    }

    /**
     * Returns whether any of the visited line numbers has a non-null source.
     */
    public boolean hasSource() {
        return hasSource;
    }

    // Implementations for LineNumberInfoVisitor.

    public void visitLineNumberInfo(Clazz clazz, Method method, CodeAttribute codeAttribute,
        LineNumberInfo lineNumberInfo) {
        int lineNumber = lineNumberInfo.u2lineNumber;

        // Remember the lowest line number.
        if (lowestLineNumber > lineNumber) {
            lowestLineNumber = lineNumber;
        }

        // Remember the highest line number.
        if (highestLineNumber < lineNumber) {
            highestLineNumber = lineNumber;
        }

        if (lineNumberInfo.getSource() != null) {
            hasSource = true;
        }
    }
}
